Purpose
Key & BPM Lab is aimed at users who need to work with musical key, tempo, and audio itself, such as DJs, music producers, instrument learners, and content creators. It splits tasks such as finding key and BPM, changing pitch or tempo, tap tempo, metronome, and audio trimming and merging into separate tools, each with a dedicated workspace and instructions.
Main capabilities
- Key and BPM detection: Select a local audio file to get tempo, musical key, scale, and Camelot code, with no upload required.
- Pitch and tempo adjustment: Change pitch or BPM independently, without affecting each other.
- BPM tapping and metronome: Tap the beat manually to determine BPM, or use the online metronome to practice at the measured tempo.
- Audio trimming and merging: Cut and splice audio.
- Extended tools (included in paid plans): vocal separation, track separation, audio enhancement, audio-to-MIDI.
- Privacy by design: The core audio analysis and editing tools read and decode files locally in the browser, and source songs are not sent to the application servers; source audio and generated results remain in browser memory, are not saved to an account or cloud storage bucket; when new audio is generated, the browser prepares the download directly on the device.
How to use
Open the corresponding tool (finder, pitch and tempo changer, trimmer, merger, tapper, or metronome), process audio locally in the browser, read the detected values, practice at the measured tempo, or download the converted audio. No account is required to use it. If some features require cloud or AI processing, the tool page explains the data sent, stored, and retained.
Use cases
- Quickly determine a song's key and BPM for mixing, covers, or practice.
- Adjust tempo without changing pitch, or transpose without changing tempo.
- Practice with a metronome at the measured BPM.
- Perform simple trimming and merging of audio.
- Consider a paid plan when you need vocal separation, track separation, audio enhancement, or audio-to-MIDI.
Limitations and paid details
Specific details such as the conditions of use for the free tools, supported audio formats, and mobile and tablet compatibility are not provided in the official materials and are not yet available. Regarding paid options, the materials show monthly subscriptions, credit packs, and a Volume+ add-on option, but specific prices are not provided. The benefits of the different plans include: file retention duration (6 hours, 7 days, or 30 days), monthly credits (1,000 or 2,500), vocal separation and track separation, audio enhancement and audio-to-MIDI, creation history, commercial use rights to generated outputs, priority AI processing queue, and priority email support. Checkout is handled by Stripe, and card information is submitted directly to Stripe and does not pass through or remain on the site's servers; the refund policy is a full refund before paid credits are used, otherwise a proportional refund based on unused paid credits.
